In Doctor Stranger, episode 2, Park Hoon(played by Lee Jong Suk) became a doctor in South Korea.
2 years have passed since Hoon came over to South Korea. He became an illegal doctor who took care of muggers who could not go to normal hospitals.
Hoon said to his patient, “I don’t receive credit cards. Cash only.” During the surgery, he also said, “100,000won for one stitch. So this would be total 1,000,000won.”